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09 29 00/NGC09 29 00/NGCNational Gypsum Company Construction Guide311Steel Stud partitionsSteel stud gypsum board partitions are comprised of steel floor and ceiling tracks, steel studs and Gold Bond®brand Gypsum Board, which is attached with drywall screws. Metal products are to meet or exceed all applicable ASTM standards.Apply gypsum board horizontally or vertically in single or multiple layers. For system-specific fire and sound ratings, please refer to pages 32-62.Non-Loadbearing Steel Stud PartitionsNATIONAL GYPSUM®COMPANY311National Gypsum Company Construction GuideSINGle-layer CoNSTruCTIoN 1. Fasten Jamb Studs to Track Top and Bottom 2. Track – Cut and Bent Down 3. C.R. Channel Stiffeners – Friction Fit (Optional) 4. Steel Door FrameCHaSe wall CoNSTruCTIoN 1. Steel Track 2. 1/2" Gypsum Board or Stud Track – 2 Screws per Stud (Alternate) 3. 3 Drywall Screws per Stud 4. Gypsum Board 5. Tape and Joint Compound12"48" Max.16' Max Height20" Max. Width Per ASTM C75412341323415
National Gypsum Company Construction GuideNATIONAL GYPSUM®COMPANY312Non-Loadbearing Steel Stud PartitionsadvaNTaGeSOpenings or knockouts throughout the length of the steel studs permit the easy horizontal routing of water, gas and electrical conduit. You may also use these openings to install Cold-Rolled Channel stiffeners where increased rigidity is required. Interruption of the floor and ceiling track allows the vertical installation of larger utilities.Fire Resistance: These systems have 1-, 2-, 3- and 4-hour fire ratings (for details refer to pages 32-62).Sound Resistance: Assemblies requiring a Sound Transmission Class (STC) may be achieved through the use of several variations of these systems (for details refer to the Fire And Sound Selector on pages 32-62). Technical dataparTITIoN HeIGHTSUse light-gauge steel studs to frame non-loadbearing partitions, which are limited in height by deflection resulting from extraneous horizontal forces. For any given horizontal load, the amount of deflection increases as the height of the partition rises.Table 1 and Table 2 (on page 313) show maximum partition heights based on specific design criteria. The height limits shown are based on the gypsum board and the steel studs acting as a composite section to provide a maximum deflection of L/120, L/240, L/360 (L = partition height in inches) with a horizontal load of 5 psf, 7.5 psf, and 10 psf of partition surface.You may increase the rigidity by placing stiffener channels through the steel stud knockouts, by using two layers of gypsum board, or by decreasing the stud spacing.Use standard 25- and 20-gauge studs for interior partitions. They have height limits as shown in Table 1 and Table 2. Attach gypsum board to full height on both sides of studs with Type S bugle-head drywall screws (Type S-12 for 20-gauge studs) spaced not more than 12 in. (305 mm) o.c. on all studs when framing is 24 in. (610 mm) o.c. and 16 in. (406 mm) o.c. if framing is 16 in. (406 mm) o.c. or less. Screw lengths must be not less than 3/8 in. (9.5 mm) greater than the total thickness of the gypsum board being fastened.Use 20-gauge steel studs for exterior, non-loadbearing curtain wall systems. Also use them for interior partitions to provide more rigidity or greater heights than can be attained with standard 25-gauge studs.limitations1. Maximum stud spacing for a single-layer application of 1/2 in. (12.7 mm) and 5/8 in. (15.9 mm) gypsum board is 24 in. (610 mm) o.c. When applying 3/8 in. (9.5 mm) gypsum board, maximum stud spacing is 16 in. (406 mm) o.c.2. Where installing long, continuous runs of gypsum board, provide control joints every 30 ft. (9,144 mm) or less.3. Where structural movement may impose direct loads on these systems, isolation details are required.4. To prevent weakening due to calcining, do not expose gypsum board to temperatures over 125 ̊F (52 ̊C) for extended periods of time.5. Gypsum board joints should not occur within 12 in. (305 mm) of the corners of door frames, unless installing control joints at these locations.6. Where reference is made to nominal gauges, 25-gauge relates to a minimum base steel of .0179 in. (0.45 mm), and 20-gauge to .0329 in. (0.84 mm).Steel Stud partitions